Thank you for the video!! 👊 im trying to figure out what supercharger I can put on my 454 with avenger 870 holley, can you help? What supercharge do you have ornrecomend? Thanks first time building and you tubing like crazy to learn
Thanks for the explanation. Although I do not exactly know how a blow through supercharger/turbocharger functions. As I would like to use an M122 GT500 Supercharger blown into a Turbocharger on an LS engine(if possible). Any thoughts, opinions or information on how this setup would or could work would be greatly appreciated. Thanks.
blow threw would be a different setup than what i showed here, if your doing a ls with a m122 that i would run holley efi on it. it would be far harder to try to make that work with a carburetor than to just use the port injection.
I'm working on a build and plan on using a 671 blower I want to use my holly 750 ultra xp u think that will be ok or do I have to run blow through carbs ?
Hey I could not tell on your video. Does your carb have two power valves? My 850 double pumper does and I am modifying it for a Weiand 174 blower. Trying to see if. Need to boost reference both valves.
My engine builder says I don't need to boost reference my carburetors on my BBC 8-71 supercharger for the strip only and just put in 8.5 or 10.5 power valves and they will open up on their own down the track but I have not seen anybody do this. What do you think?
Using the boost reference power valve makes part throttle better. You could probably be just fine running without one on the track. Assuming you have plenty of carb on it as to not create a vacuum under the carb at wot. I would still do it anyway because with positive pressure on the boost valve it will insure that the power valve can't close leaning out the engine when. Your under boost
the only stupid question is the one not asked. you don't know if you don't know. but the installation does not really share anything in common between blowers and turbo's. they both create positive air pressure inside the intake but that's about where the similarity end. turbo basically scavenges of the exhaust from the to drive a compressor wheel that then needs to be plumbed to the intake the exhaust needs to be plumped from the manifolds/headers into the other side of the turbo oil feed and drain lines added ect. superchargers are a bit less efficient as they use power from the crank pulley to drive the compressor. but although they make less total power they produce a lot more torque and much better throttle response. and are a bit simpler to install.
@@Ezrider359 Thank you for the explanation. Would this carburetor set up work with a turbocharger since the pressure would be forced through it as apposed to the blower pulling the air through it?
all the drag strips in my region are already shut down for the winter. iv got a little bit to do before its drag strip ready. need to do some bracing to the rear sub frame to make sure it doesn't rip the bushing apart launching it with real traction. the drive shaft that is in it i made myself when i did the swap and has a little bit of vibration above 80mph so i need to get a proper driveshaft made. need to add a drive shaft safety loop as well. a couple other little odd and end things probably going to add water methanol injection as well. hopefully ill get all that done over the winter months and get it to the first test and tune weekend at the drag strip after i wrap up hauling spring fertilizer.
i am pretty anxious though to get it on the track and see what kind of numbers it can make. i use a acceleraromator a bit dialing in tuning changes as the seat of your pants can be hard to tell the impact on small changes. with my current tires on the street im generally traction limited at between .75-.80 g's best reading iv gotten is 1.02 at the top of 2nd gear but there is a lot to gain with traction, it will consistently pull greater than .70g's in 3rd gear. in the little acceleration clip in this video using the video timing marks was 4.92 seconds 0-60 and i wasn't wide open till over 45mph and was almost completely out of the throttle on the 1-2 shift at 40mph trying find traction.
So why the tube. If your using manifold vacuum anyway. Why can't you use a boost reference power valve. The manifold vacuum is still going to be under boost right I'm confused. I'm planning on putting the same supercharger on my engine. And looking at what mods need to be done on the carb. The carb I plan on using is a Holley HP 750 dp
The tube is moving the reference point from under the carb to under the blower. The false vacuum under the carb isn't the best place to get your power valve reference. By changing it to reference manifold pressure under the blower the power valve will see the same vacuum/boost the engine sees.
@@Ezrider359 my manifold has a vacuum port and I have a fitting for 3 different size sources like for brake booster and for like cruise control or something else that requires manifold vacuum. Why can't you use that and the corresponding small vacuum port in the base plate or is yours different then the one I'm using. I know you don't want to use the ported vacuum on the side I'm going to watch it again maybe there's something I missed
All that stuff still comes off where it normally would on the carb above the supercharger. The only thing I changed is where the power valve gets its signal. Blocking the internal passage and making a port to attach a vac hose to connect below the blower. Holly sells supercharger ready carbs that already have that modification done
Thank you for the video!! 👊 im trying to figure out what supercharger I can put on my 454 with avenger 870 holley, can you help? What supercharge do you have ornrecomend? Thanks first time building and you tubing like crazy to learn
Thanks for the explanation. Although I do not exactly know how a blow through supercharger/turbocharger functions. As I would like to use an M122 GT500 Supercharger blown into a Turbocharger on an LS engine(if possible). Any thoughts, opinions or information on how this setup would or could work would be greatly appreciated. Thanks.
blow threw would be a different setup than what i showed here, if your doing a ls with a m122 that i would run holley efi on it. it would be far harder to try to make that work with a carburetor than to just use the port injection.
@Ezrider359 Thanks for your insights, although for simplicity I might just go with a single S475 turbo.
I'm working on a build and plan on using a 671 blower I want to use my holly 750 ultra xp u think that will be ok or do I have to run blow through carbs ?
Hey I could not tell on your video. Does your carb have two power valves? My 850 double pumper does and I am modifying it for a Weiand 174 blower. Trying to see if. Need to boost reference both valves.
Not really any reason to run a power valve in the secondary you can just put a block off in the secondary and jet it up
My engine builder says I don't need to boost reference my carburetors on my BBC 8-71 supercharger for the strip only and just put in 8.5 or 10.5 power valves and they will open up on their own down the track but I have not seen anybody do this. What do you think?
Using the boost reference power valve makes part throttle better. You could probably be just fine running without one on the track. Assuming you have plenty of carb on it as to not create a vacuum under the carb at wot. I would still do it anyway because with positive pressure on the boost valve it will insure that the power valve can't close leaning out the engine when. Your under boost
Dope
That is a small carb for running a single and do you run the fuel bowls dry/low under boost?How much boost?
No needle and seat can flow enough even for e85 if you have enough fuel pump. 7psi of boost
@@Ezrider359 You can try a solinoid bowl if you have the $I have seen it on blow thru carbs.just fyi
Potentially stupid question... Would you do anything different from what you did here, if you were going with a turbocharger vs a supercharger?
the only stupid question is the one not asked. you don't know if you don't know. but the installation does not really share anything in common between blowers and turbo's. they both create positive air pressure inside the intake but that's about where the similarity end. turbo basically scavenges of the exhaust from the to drive a compressor wheel that then needs to be plumbed to the intake the exhaust needs to be plumped from the manifolds/headers into the other side of the turbo oil feed and drain lines added ect. superchargers are a bit less efficient as they use power from the crank pulley to drive the compressor. but although they make less total power they produce a lot more torque and much better throttle response. and are a bit simpler to install.
@@Ezrider359 Thank you for the explanation. Would this carburetor set up work with a turbocharger since the pressure would be forced through it as apposed to the blower pulling the air through it?
@@randallmills509 no.
No, you need to make modifications to make the carb blow thru if you’re using a turbo. Plenty of good vids on the topic. It’s not hard.
Nice!!! 👌🏿👌🏿👌🏿
thank you
What kind of car is this?
its a 1993 jaguar xjs convertible that i swapped a small block chevy engine and 700r4 transmission into.
So when you going to the track ?
all the drag strips in my region are already shut down for the winter. iv got a little bit to do before its drag strip ready. need to do some bracing to the rear sub frame to make sure it doesn't rip the bushing apart launching it with real traction. the drive shaft that is in it i made myself when i did the swap and has a little bit of vibration above 80mph so i need to get a proper driveshaft made. need to add a drive shaft safety loop as well. a couple other little odd and end things probably going to add water methanol injection as well. hopefully ill get all that done over the winter months and get it to the first test and tune weekend at the drag strip after i wrap up hauling spring fertilizer.
i am pretty anxious though to get it on the track and see what kind of numbers it can make. i use a acceleraromator a bit dialing in tuning changes as the seat of your pants can be hard to tell the impact on small changes. with my current tires on the street im generally traction limited at between .75-.80 g's best reading iv gotten is 1.02 at the top of 2nd gear but there is a lot to gain with traction, it will consistently pull greater than .70g's in 3rd gear. in the little acceleration clip in this video using the video timing marks was 4.92 seconds 0-60 and i wasn't wide open till over 45mph and was almost completely out of the throttle on the 1-2 shift at 40mph trying find traction.
So why the tube. If your using manifold vacuum anyway. Why can't you use a boost reference power valve. The manifold vacuum is still going to be under boost right I'm confused. I'm planning on putting the same supercharger on my engine. And looking at what mods need to be done on the carb. The carb I plan on using is a Holley HP 750 dp
The tube is moving the reference point from under the carb to under the blower. The false vacuum under the carb isn't the best place to get your power valve reference. By changing it to reference manifold pressure under the blower the power valve will see the same vacuum/boost the engine sees.
@@Ezrider359 my manifold has a vacuum port and I have a fitting for 3 different size sources like for brake booster and for like cruise control or something else that requires manifold vacuum. Why can't you use that and the corresponding small vacuum port in the base plate or is yours different then the one I'm using. I know you don't want to use the ported vacuum on the side I'm going to watch it again maybe there's something I missed
All that stuff still comes off where it normally would on the carb above the supercharger. The only thing I changed is where the power valve gets its signal. Blocking the internal passage and making a port to attach a vac hose to connect below the blower. Holly sells supercharger ready carbs that already have that modification done
If you don’t understand what he did or why you should definitely read more before supercharging your car.